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Email bounce rate is the percentage of sent emails that could not be delivered to recipients' inboxes. It is calculated by dividing the number of bounced emails by the total number of emails sent, then multiplying by 100. Bounce rate is a critical metric for email deliverability - high bounce rates damage sender reputation and can lead to blacklisting.
Bounce rate is a key indicator of list quality and sending practices. Email providers use it to evaluate whether you maintain your list and follow best practices. A high bounce rate signals that you may be sending to purchased lists, old lists, or collecting emails without verification. This damages your sender reputation and affects deliverability for all your emails. ISPs may throttle or block senders with consistently high bounce rates. Industry benchmarks suggest keeping bounce rates below 2% for healthy email programs.
When you send an email, the receiving mail server either accepts it or rejects it (bounces). Bounces are categorized as hard bounces (permanent failures like invalid addresses) or soft bounces (temporary issues like full mailboxes). Your bounce rate combines both types. For example, if you send 10,000 emails and 300 bounce, your bounce rate is 3%. Email service providers track your bounce rate over time, and consistently high rates trigger spam filters and reputation damage. Most ESPs will suspend accounts that maintain bounce rates above 5-10%.
A good bounce rate is under 2%. Rates between 2-5% indicate list hygiene issues that need addressing. Rates above 5% are problematic and will affect deliverability. If your bounce rate exceeds 10%, stop sending and clean your list immediately before continuing.
Hard bounce rate measures permanent delivery failures (invalid addresses, non-existent domains). Soft bounce rate measures temporary failures (full mailbox, server temporarily unavailable). Hard bounces should be removed immediately; soft bounces should be retried and removed after multiple failures. Both contribute to your overall bounce rate.
To reduce bounce rate: 1) Verify email addresses at collection using real-time API validation, 2) Clean your existing list with an email verification service, 3) Remove all hard bounces immediately, 4) Use double opt-in for new subscribers, 5) Send consistently to keep addresses active in your list, 6) Never use purchased lists.
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